ATOMIC PERFORMANCE PRODUCTS. Atomic Performance Products manufacture high performance engines and components for imported and local vehicles such as Ford Falcon XR6-T Turbo and Nissan RB25, RB26 and RB30. We make billet steel conrods and race

These days it is quite easy to make serious power from the Ford XR6-Turbo engines. With a myriad of bolt on components and quality tuning packages available, it is commonplace to see vehicles producing 50%-75% more power than the stock figure of 170-190 RWKW.

To achieve these increases of this magnitude, substantial additional loads are placed on critical internal engine components such as pistons, conrods, engine bearings, etc. Another factor that contributes significantly to these additional loadings is abnormal combustion - also known as detonation, pinging, rattling or knocking*.

This occurs far more frequently in vehicles that are tuned or modified to produce more power than standard vehicles.

Detonation/pinging creates extremely violent combustion shock loadings, as the actual combustion process is completely transformed in nature from normal combustion.

The easiest way to explain the differences between "normal combustion" and "detonation combustion" is to imagine a small amount of petrol is poured along a flat surface, and then lit. When it is ignited the flame runs along the line of poured fuel, gradually lighting it all along the way. This is how "normal combustion" takes place in the engine. The air/fuel mix is ignited by the ignition source and the resultant flame propagates across the combustion chamber, consuming most of the fuel/air mix along the way. Combustion pressure pushes the piston in a downward motion and this vertical movement is turned into rotating motion by the conrod and crankshaft.

By comparison, "detonation combustion" is like an instantaneous explosion in the combustion chamber, rather than a controlled burn that builds cylinder pressure gradually. The explosion is like dynamite going off in the cylinder, with huge cylinder pressures blasting out in all directions at once. Everything in the combustion chamber is smashed into by this force, cracking pistons, hammering the piston rings, shattering spark plugs and, in the case of XR6-Turbos, bending/breaking the conrods.

Experienced engine builders/tuners are aware of the damage this damaging combustion can cause - all it takes is a bad batch of fuel, coupled with a higher than standard state of tune and the results can be disastrous.......even if the vehicle is tuned perfectly. Modern vehicles have highly developed NVH systems that reduce the sound of detonation, so it often occurs without the driver even knowing......

So, before the damage is done and you are up for a new engine, cast an eye over our bulletproof bottom end rebuild kits. Utilizing exactly the same componentry as fitted to our record setting race prepped short motors, Atomic rebuild kits are ideal to upgrade XR6-T's to handle big power increases.

Atomic Bulletproof bottom end kits suit XR6-T # 306350 comprises the following:

Forged pistons, H/D gudgeon pins and H/D locks - pistons available in a range of sizes as required

Atomic billet steel conrods fitted with ARP bolts

Nitro carburised turbo ring set

ACL Competition main bearings

ACL Competition conrod bearings

Engine assembly lube

8 litres of Castrol ProTec mineral/synthetic fortified running in oil

Genuine Ford oil filter

*For further information regarding the combustion process and engines in general, please refer to "The High Speed Internal Combustion Engine" - by Sir Harry Ricardo.

http://www.ricardo.com/ricardoStore/product.asp?numRecordPosition=2&P_ID=149